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Rev. D
|
Page 40 of 56
|
November 2008
ADSP-21367/ADSP-21368/ADSP-21369
S/PDIF Transmitter
Serial data input to the S/PDIF transmitter can be formatted as
left justified, I
2
S, or right justified with word widths of 16, 18, 20,
or 24 bits. The following sections provide timing for the
transmitter.
S/PDIF Transmitter—Serial Input Waveforms
shows the right-justified mode. LRCLK is high for the
left channel and low for the right channel. Data is valid on the
rising edge of SCLK. The MSB is delayed 12-bit clock periods
(in 20-bit output mode) or 16-bit clock periods (in 16-bit output
mode) from an LRCLK transition, so that when there are 64
SCLK periods per LRCLK period, the LSB of the data is right-
justified to the next LRCLK transition.
2
S-justified mode. LRCLK is low
for the left channel and high for the right channel. Data is valid
on the rising edge of SCLK. The MSB is left-justified to an
LRCLK transition but with a single SCLK period delay.
shows the left-justified mode. LRCLK is high for the
left channel and low for the right channel. Data is valid on the
rising edge of SCLK. The MSB is left-justified to an LRCLK
transition with no MSB delay.
Figure 29. Right-Justified Mode
DAI_P20
-
1
LRCLK
DAI_P20
-
1
S
CLK
DAI_P20
-
1
S
DATA
LEFT CHANNEL
RIGHT CHANNEL
M
S
B-1
M
S
B-2
L
S
B+2 L
S
B+1
L
S
B
M
S
B
M
S
B-1
M
S
B-2
L
S
B+2
L
S
B+1
L
S
B
L
S
B
M
S
B
Figure 30. I
2
S-Justified Mode
M
S
B-1
M
S
B-2
L
S
B+2 L
S
B+1
L
S
B
LEFT CHANNEL
RIGHT CHANNEL
M
S
B
M
S
B-1
M
S
B-2
L
S
B+2
L
S
B+1
L
S
B
M
S
B
M
S
B
DAI_P20
-
1
LRCLK
DAI_P20
-
1
S
CLK
DAI_P20
-
1
S
DATA
Figure 31. Left-Justified Mode
LEFT CHANNEL
RIGHT CHANNEL
M
S
B-1
M
S
B-2
L
S
B+2
L
S
B+1
L
S
B
M
S
B
M
S
B-1
M
S
B-2
L
S
B+2
L
S
B+1
L
S
B
M
S
B
M
S
B+1
M
S
B
DAI_P20
-
1
LRCLK
DAI_P20
-
1
S
CLK
DAI_P20
-
1
S
DATA